diff --git a/rally/plugins/openstack/verification/tempest/context.py b/rally/plugins/openstack/verification/tempest/context.py
index ff6f0855..a6649748 100644
--- a/rally/plugins/openstack/verification/tempest/context.py
+++ b/rally/plugins/openstack/verification/tempest/context.py
@@ -233,7 +233,7 @@ class TempestContext(context.VerifierContext):
         }
         LOG.debug("Creating image '%s'." % params["image_name"])
         image_service = image.Image(self.clients)
-        image_obj = image_service.create_image(params)
+        image_obj = image_service.create_image(**params)
         LOG.debug("Image '%s' (ID = %s) has been "
                   "successfully created!" % (image_obj.name, image_obj.id))
         self._created_images.append(image_obj)
diff --git a/tests/unit/plugins/openstack/verification/tempest/test_context.py b/tests/unit/plugins/openstack/verification/tempest/test_context.py
index 640c66dd..658ccc97 100644
--- a/tests/unit/plugins/openstack/verification/tempest/test_context.py
+++ b/tests/unit/plugins/openstack/verification/tempest/test_context.py
@@ -229,7 +229,7 @@ class TempestContextTestCase(test.TestCase):
                   "disk_format": CONF.tempest.img_disk_format,
                   "image_name": mock.ANY,
                   "visibility": "public"}
-        client.create_image.assert_called_once_with(params)
+        client.create_image.assert_called_once_with(**params)
 
     def test__discover_or_create_flavor_when_flavor_exists(self):
         client = self.context.clients.nova()